Re: KASAN vs. boot-time switching between 4- and 5-level paging

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To: "Kirill A. Shutemov" <kirill@xxxxxxxxxxxxx>
Subject: Re: KASAN vs. boot-time switching between 4- and 5-level paging
From: Andrey Ryabinin <aryabinin@xxxxxxxxxxxxx>
Date: Mon, 10 Jul 2017 19:57:00 +0300
Cc: Dmitry Vyukov <dvyukov@xxxxxxxxxx>, Alexander Potapenko <glider@xxxxxxxxxx>, "Kirill A. Shutemov" <kirill.shutemov@xxxxxxxxxxxxxxx>, Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>, Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>, "x86@xxxxxxxxxx" <x86@xxxxxxxxxx>, Thomas Gleixner <tglx@xxxxxxxxxxxxx>, Ingo Molnar <mingo@xxxxxxxxxx>, "H. Peter Anvin" <hpa@xxxxxxxxx>, Andi Kleen <ak@xxxxxxxxxxxxxxx>, Dave Hansen <dave.hansen@xxxxxxxxx>, Andy Lutomirski <luto@xxxxxxxxxxxxxx>, linux-arch@xxxxxxxxxxxxxxx, "linux-mm@xxxxxxxxx" <linux-mm@xxxxxxxxx>, LKML <linux-kernel@xxxxxxxxxxxxxxx>, kasan-dev <kasan-dev@xxxxxxxxxxxxxxxx>
In-reply-to: <20170710123346.7y3jnftqgpingim3@node.shutemov.name>
References: <20170525203334.867-1-kirill.shutemov@linux.intel.com> <20170525203334.867-8-kirill.shutemov@linux.intel.com> <20170526221059.o4kyt3ijdweurz6j@node.shutemov.name> <CACT4Y+YyFWg3fbj4ta3tSKoeBaw7hbL2YoBatAFiFB1_cMg9=Q@mail.gmail.com> <71e11033-f95c-887f-4e4e-351bcc3df71e@virtuozzo.com> <CACT4Y+bSTOeJtDDZVmkff=qqJFesA_b6uTG__EAn4AvDLw0jzQ@mail.gmail.com> <c4f11000-6138-c6ab-d075-2c4bd6a14943@virtuozzo.com> <75acbed7-6a08-692f-61b5-2b44f66ec0d8@virtuozzo.com> <bc95be68-8c68-2a45-c530-acbc6c90a231@virtuozzo.com> <20170710123346.7y3jnftqgpingim3@node.shutemov.name>
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On 07/10/2017 03:33 PM, Kirill A. Shutemov wrote:

> 
> [Sorry for loong delay.]
> 
> The patch works for me for legacy boot. But it breaks EFI boot with
> 5-level paging. And I struggle to understand why.
> 
> What I see is many page faults at mm/kasan/kasan.c:758 --
> "DEFINE_ASAN_LOAD_STORE(4)". Handling one of them I get double-fault at
> arch/x86/kernel/head_64.S:298 -- "pushq %r14", which ends up with triple
> fault.
> 
> Any ideas?
> 
> If you want to play with this by yourself, qemu supports la57 -- use
> -cpu "qemu64,+la57".
> 

I'll have a look.

References:
- [PATCHv1, RFC 0/8] Boot-time switching between 4- and 5-level paging
  - From: Kirill A. Shutemov
- [PATCHv1, RFC 7/8] x86/mm: Hacks for boot-time switching between 4- and 5-level paging
  - From: Kirill A. Shutemov
- KASAN vs. boot-time switching between 4- and 5-level paging
  - From: Kirill A. Shutemov
- Re: KASAN vs. boot-time switching between 4- and 5-level paging
  - From: Dmitry Vyukov
- Re: KASAN vs. boot-time switching between 4- and 5-level paging
  - From: Andrey Ryabinin
- Re: KASAN vs. boot-time switching between 4- and 5-level paging
  - From: Dmitry Vyukov
- Re: KASAN vs. boot-time switching between 4- and 5-level paging
  - From: Andrey Ryabinin
- Re: KASAN vs. boot-time switching between 4- and 5-level paging
  - From: Andrey Ryabinin
- Re: KASAN vs. boot-time switching between 4- and 5-level paging
  - From: Andrey Ryabinin
- Re: KASAN vs. boot-time switching between 4- and 5-level paging
  - From: Kirill A. Shutemov

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